Lambeet schmidt



No. 750,300. PATENTBD 00.10.26, 1904. L. SCHMIDT.

ANNUNGIATGP.. APPLIATION FILED AUG. 28. 1.901.

N0 MODEL.

ai Il UNITED STATES Patented .Tanuary 26, 1904.

PATENT OFFICE.

ANNUNCIATOR.

SPECIFICATION forming part of Letters Patent N o. 750,309, dated January 26, 1904.

Application fue@ August 28, 1901. serial No. 73,552. (No model.)

To all wir/m, it may concern:

Beit known that I, LAMBERT SCHMIDT, a citizen of the United States, whose residence and vpost-oiiice address is VVeehawken, State of New Jersey, have invented certain new and useful Improvements in Annunciators, of which the following is a speciication, reference being had to the accompanying drawings.

This invention relates to the general classV y with the invention the magnet and its armature are so arranged as to form a magnetic circuit which is closed except for a very small air-gap, thereby requiring very little batterypower for the operation of the device, the armature is so supported as to ofer very little resistance to its movement by the magnet, and the drop or signal and the armature are so related that the drop is moved very easily and returns by its own weight to its normal position when the circuit through the magnet is opened.

The invention will be more fully described hereinafter, with reference to the accompanying drawings, in which a convenient and practical embodiment of the invention is illustrated for purposes of explanation.

In said drawings, Figure l is a view in side elevation of a self-restoring telephone-drop constructed and arranged in accordance with the invention. Fig. 2 is a longitudinal vertical section of the same. Fig. 3 is a view in elevation of the front end, and Fig. 4 is a similar view of the rear end of the same. Fig.

5 is a detail perspective view of the rear end of the magnet-core, which is shaped at this end to form a knife-edge for purposes to be referred to hereinafter.

The coil a is wound upon the core in the usual manner, and upon the front end of the latter is secured a pole-piece c, which is relatively fiat and is disposed in the plane of said end. The rear end of the core is taL pered or beveled to a knife-edge d, upon which the armature e is mounted, having a V-shaped notch to receive the knife-edge. The armature is L-shaped and its forward end overlies the pole-piece c, this member of the armature being substantially parallel with the core. The other and shorter member or arm of the armature rests against the knife-edge Z and may be held from accidental dislodgment by a small screw f, which passes loosely through a slot g in the armature into the end of the core the head of the screw having a diameter greater than the width of the slot. For the purpose of balancing the weight of the longer member of the armature and for effecting any desired adjustment a spring' t may be arranged to bear against the extremity of the shorter arm of the armature, the necessary adjustment being effected by a nut t', threaded on the end of a pin 7, which is fixed Ain the rear head of the magnet. A shutter m is hung in a suitable frame or support n and is normally held in a vertical position, a iinger or projection 0 of the shutter resting under the free end of the armature e.

It will be readily understood that the mounting of the armature upon the knife-edge d insures very free movement of the armature with a minimum of resistance and a minimum liability to derangement. Furthermore, by mounting the armature directly upon and in contact with the core of the magnet a magnectic circuit is formed, and the armature will therefore be moved with very little batterypower through the circuit of the magnet. As the free end of the armature rests upon the finger or projection of the shutter, it will be seen that when the magnet is energized and the armature attracted the shutter will be immediately swung from its normal position, to which it will return of its own weight when the circuit of the magnet is opened and the free end of the armature is raised by the action of the spring L. Any necessary adjustment of the armature is readily effected by adjustment of the nutz' on the pin 1.

IOO

I claim as my invention-- l. In an annunciator, the combination of a magnet-core having a relatively flat pole-piece disposed in the plane of one end and having its other end extended, an armature mounted upon the extended end of the core and having its free end overlying the pole-piece, a spring to cooperate with said armature, and a shutter normally held in a vertical position and in operative relation with said armature, substantially as shown and described.

2. In an annunciator, the combination of a magnet-core having a pole-piece at one end and having its other end beveled to form a knifeedge, an armature mounted upon said knifeedge and having its free end overlying the pole-piece, a spring to cooperate with said armature, and a shutter in operative relation with said armature, substantially as shown and described.

3. In an annunciator, the combination of a magnet-core having a pole-piece at one end and having its other end beveled to form a knife-edge, an armature mounted upon said knife edge, and a screw passing loosely through said armature into said core to prevent accidental dislodgment of the armature from the knife-edge, substantially as shown and described.

4. In an annunciator, the combination of a magnet-core having a pole-piece at one end, an L-shaped armature, mounted upon the other end of said core, and having its free end overlying the pole-piece, a pin passed through the armature into the head of the magnet and having an adjusting-nut, and a spring interposed between said nut and the armature, substantially as shown and described.

In an annunciator, the combination of a magnet-core having a relatively iat pole-piece disposed in the plane of one end, an armature mounted at the other end of the magnet and overlying the pole-piece, and a shutter hung in a suitable support and held normally in a vertical position, said shutter having a {inge-r or projection underlying the free end of the armature, substantially as shown and described.

This specification signed and witnessed this 22d day of August, A. D. 1901.

LAMBERT SCHMIDT.

In presence of- DANL. A. SLATTERY, ROBERT B. TAYLOR. 

